ASoC: wcd9330: use hwdep nodes to get calibration

Use hwdep node to use calibration and at the same
time keep the code backward compatible. Codec
driver can still use request_firmware to get the
calibration if hwdep is not available.

Change-Id: Ia262a315eec137afdf69334ae91e5da01e28fb8b
Signed-off-by: Anish Kumar <kanish@codeaurora.org>